FACTS  AND  FORMULAE  FOR  AVERAGE QUESTIONS

 

 

1. Average =Sum of observationsNo. of observations

2. Suppose a man covers a certain distance x kmph and an equal distance at y kmph. Then, the average speed during the whole journey is2xyx+yKmph

Q:

The average of 7 numbers is 30. If the average of first three numbers is 25 and that of last three numbers is 35, then what is the fourth number?

A) 30 B) 35
C) 37.5 D) 40
 
Answer & Explanation Answer: A) 30

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Q:

In the first 36 overs of a cricket match, the run rate was 4.3 runs/over. Calculate the required run rate in the remaining 14 overs to reach the target of 271 runs?

A) 8.9 B) 9.5
C) 8.3 D) 7.7
 
Answer & Explanation Answer: C) 8.3

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Q:

Average of the marks of 132 students of a college is 40. If the average of the marks of the passed students is 42 and the average of the marks of the failed students is 20, then what will be the respective ratio of the total marks of passed students and the total marks of failed students?

 

A) 21 : 1   B) 23 : 2
C) 19 : 11 D) 9 : 2
 
Answer & Explanation Answer: A) 21 : 1  

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Q:

The average revenues of 7 consecutive years of a company is Rs 79 lakhs. If the average of first 4 years is Rs 74 lakhs and that of last 4 years is Rs 86 lakhs, what is the revenue for the 4th year?

A) Rs 87 lakhs B) Rs 89 lakhs
C) Rs 85 lakhs D) Rs 83 lakhs
 
Answer & Explanation Answer: A) Rs 87 lakhs

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Q:

The average salary of all workers in a workshop is Rs.12000. The average salary of 7 technicians is Rs.15000 and the average salary of the rest is Rs.9000. The total number of workers in the workshop is

A) 12 B) 13
C) 14 D) 15
 
Answer & Explanation Answer: C) 14

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Q:

Of the 3 numbers whose average is 112, the first is 3/13 times the sum of other 2. The first number is _____.

A) 63 B) 95
C) 42 D) 126
 
Answer & Explanation Answer: A) 63

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Q:

The mean of the data 1, 1/2, 1/2, 3/4, 1/4, 2, 1/2, 1/4, 3/4 is

A) 15/18 B) 13/18
C) 7/9 D) 8/9
 
Answer & Explanation Answer: B) 13/18

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Q:

The average monthly salary of 19 members of a group is Rs. 16000. If one more members whose monthly salary is Rs. 20000 has joined the group, then the average salary of the group is

A) Rs.18250 B) Rs.16200
C) Rs.18000 D) Rs.16250
 
Answer & Explanation Answer: B) Rs.16200

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